22643863849 has 2 divisors, whose sum is σ = 22643863850. Its totient is φ = 22643863848.

The previous prime is 22643863841. The next prime is 22643863861. The reversal of 22643863849 is 94836834622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18616692249 + 4027171600 = 136443^2 + 63460^2 .

It is a cyclic number.

It is not a de Polignac number, because 22643863849 - 2³ = 22643863841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22643863849.

It is not a weakly prime, because it can be changed into another prime (22643863841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11321931924 + 11321931925.

It is an arithmetic number, because the mean of its divisors is an integer number (11321931925).

Almost surely, 2^22643863849 is an apocalyptic number.

It is an amenable number.

22643863849 is a deficient number, since it is larger than the sum of its proper divisors (1).

22643863849 is an equidigital number, since it uses as much as digits as its factorization.

22643863849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11943936, while the sum is 55.

The spelling of 22643863849 in words is "twenty-two billion, six hundred forty-three million, eight hundred sixty-three thousand, eight hundred forty-nine".